At least 104 people were killed when 14 coaches of an overnight passenger train rolled off the track in northern India early Sunday, with rescue workers using cutting torches to try to pull out survivors, police said.

Daljeet Chaudhary, a director general of police, said the death toll was likely to rise because rescue workers had yet to gain access to one of the worst-damaged coaches. About 150 people were injured, he said.

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The train derailed at around 3:10 a.m., jolting awake passengers who had settled in for the long trip. The bodies were retrieved from mangled coaches that had fallen on their side.

One of the passengers, Satish Kumar, said the train was traveling at normal speed when it stopped suddenly.

"It restarted, and then we heard a crash," said Kumar, whose coach remained standing on the track. "When we came out of the train, we saw a few coaches had derailed."

Some of the coaches crumpled when they crashed into others, trapping hundreds of people inside.

The cause of the derailment was not immediately clear.

Rescue workers, soldiers and members of India's disaster management force pulled 104 bodies from the wreckage, said Chaudhary, inspector-general of police in Uttar Pradesh state.

Rescuers used cutting torches to open the derailed train cars to try to reach those trapped inside, while cranes were deployed to lift the coaches from the tracks. However, they were moving cautiously because some of the coaches were precariously tilted, and there was a danger of the coach toppling over, possibly injuring those trapped inside.

"We are being very careful in using the cutting torches," Chaudhary said.

Medical teams were providing first aid near the site, while the more seriously injured were moved to hospitals in Kanpur, Chaudhary said. Of the roughly 150 injured, 72 were in serious condition, he said.

The derailment occurred near the village of Pukhrayan, outside of Kanpur, an industrial city about 400 kilometers (250 miles) southeast of New Delhi. The Patna-Indore Express train, linking the central Indian city of Indore to the city of Patna to its northeast, completes its 1,360-kilometer (845-mile) journey in 27 hours.

Police were having a hard time keeping away hundreds of people from nearby villages who were the first to reach the accident site. "We have cordoned off some areas near the coaches to keep people from hampering the rescue efforts," Chaudhary said.

Prime Minister Narendra Modi expressed his concern over the derailment.

"Anguished beyond words on the loss of lives due to the derailing of the Patna-Indore express. My thoughts are with the bereaved families," Modi posted on his Twitter account.

Kanpur is a major railway junction, and hundreds of trains pass through the city every day. After the derailment, several trains using the line were diverted to other routes, Anil Saxena, spokesman for Indian Railways, said in New Delhi.

Rail authorities have ordered an investigation into the incident, Saxena said.

Accidents are relatively common on India's sprawling rail network, which is the world's third largest but lacks modern signaling and communication systems. Most crashes are blamed on poor maintenance and human error.

In 2012, an Indian government report said about 15,000 people are killed every year in train accidents, caused mainly by outdated equipment and overstretched staff.

The country's worst railway accident occurred in 1981, when a passenger train fell into the Baghmati River in northern India, killing nearly 800 people.

Prime Minister Modi has pledged to invest $137 billion over the next five years to modernize India's railway network, which is used by around 23 million passengers a day.